http://www.footballoutsiders.com/stat-analysis/2015/nfl-injuries-part-ii-variation-over-time

Nothing about his injuries tell me that he has a specific weakness in tendons (like Staley) or other parts of his body that make him significantly more prone to injury than any other player.

The statistics say that the likelihood of sustaining an injury that will cause a player to not play are about 20-25%, so all I would conclude is that Taysom has had the misfortune of ending up in that 25% 3 times now, the odds say that it would have happened at least 1 year, because he has played 4 years for us anyway, regardless of position or injury history.

That doesn't change the probability of injury for him next year, he has the same 20-25% probability of injury, which means, he is 75% likely to be healthy, I will give you that because he is aggressive, he is on the higher end of that risk stata, but it still tells me, you don't assume failure when the risk of that failure is lower than the risk of success.

just because Taysom has flipped a coin and had 3 heads in a row, doesn't make it more likely that the next flip will be heads.

Taysom broke his ankle against USU last year on a roll out... Tanner puts himself in that position several times every game. Do you assume that because Taysom had his ankle broken on a rollout, that Tanner will assuredly break his ankle at some point in the near future because of his tendency to roll out of the pocket?